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A variety of tourmaline varying in color from a pale rose to a deep ruby, and containing lithium.

Rubella.

Pertaining to, or designating, an acid extracted from madder root. It is a yellow crystalline substance from which alizarin is obtained.

The quality or state of being rubescent; a reddening; a flush.

Growing or becoming red; tending to redness.

Of or pertaining to a very large natural order of plants (Rubiaceæ) named after the madder (Rubia tinctoria), and including about three hundred and seventy genera and over four thousand species. Among them are the coffee tree, the trees yielding peruvian bark and quinine, the madder, the quaker ladies, and the trees be…

A substance found in madder root, and probably identical with ruberythrinic acid.

One of several color-producing glycosides found in madder root.

pertaining to, or derived from, rubian; specifically, designating an acid called also ruberythrinic acid. [Obs.]

Colored a prevailing red, bay, or black, with flecks of white or gray especially on the flanks; -- said of horses. Smart.

A variety of ruby of a yellowish red color, from Brazil.

A small river which separated Italy from Cisalpine Gaul, the province alloted to Julius Cæsar.

Inclining to redness; ruddy; red. "His rubicund face." Longfellow.

The quality or state of being rubicund; ruddiness. To parade your rubicundity and gray hairs. Walpole.

Of or pertaining to rubidium; containing rubidium.

ar as an oily liquid, C11H17N; also, any one of the group od metameric compounds of which rubidine is the type.

A rare metallic element. It occurs quite widely, but in small quantities, and always combined. It is isolated as a soft yellowish white metal, analogous to potassium in most of its properties. Symbol Rb. Atomic weight, 85.2.

Making red; as, rubific rays. Grew.

The act of making red. Howell.

Having the nature or quality of red; as, the rubiform rays of the sun. [R.] Sir I. newton.